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Motion in a Straight Line — NEET & JEE Physics MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
10/14/6easy / medium / hard
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Sample questions from this chapter

When is it reasonable to model a moving train as a point object?
  1. When its length is negligible compared with the distance being studied ✓
  2. When the rotation of each wheel must be tracked
  3. When different parts of the train enter a platform at different times
  4. When its bending and vibration determine the observation
Answer: A. A point-object model is adequate when the object's dimensions are much smaller than the distance relevant to the motion. A train can therefore be a point between distant stations, but not while its length controls platform-crossing time.
Why not B: Tracking wheel rotation requires the size and orientation of an extended body, so the point approximation has been applied outside its useful scale.
Why not C: Platform-entry timing depends directly on train length, which a point model discards.
Why not D: Deformation describes relative motion of different parts and cannot be retained in a single point coordinate.
The position of a particle is x = 2 + 3t², with x in metres and t in seconds. What is its velocity at t = 2 s?
  1. 6 m s⁻¹
  2. 8 m s⁻¹
  3. 12 m s⁻¹ ✓
  4. 14 m s⁻¹
Answer: C. Velocity is dx/dt = 6t, so at 2 s it is 12 m s⁻¹. The 14 m s⁻¹ distractor comes from using the position value without differentiating.
Why not A: This keeps only the coefficient 2 × 3 after differentiating and forgets the remaining factor t.
Why not B: This substitutes t = 2 into 2 + 3t and treats an invented linear expression as velocity.
Why not D: This evaluates the position x(2) = 14 m and relabels it as a velocity.
A body starts from rest and falls freely with g = 10 m s⁻². How far does it travel during the fifth second?
  1. 45 m ✓
  2. 25 m
  3. 80 m
  4. 125 m
Answer: A. The fifth-second distance is s(5) − s(4) = 125 − 80 = 45 m, matching Galileo's 1:3:5:7:9 sequence. The 125 m option confuses 'during the fifth second' with 'in five seconds.'
Why not B: This uses ½gn = 25 m, forgetting to square the five seconds in the total-distance expression before attempting the interval calculation.
Why not C: This reports the total distance after 4 s, ½g(4²), rather than subtracting it from the five-second total.
Why not D: This reports the total distance after 5 s, ½g(5²), instead of the distance in the fifth second alone.

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Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Motion in a Straight Line →

Other NEET Physics chapters

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Questions

How many NEET and JEE questions are there on Motion in a Straight Line?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET and JEE Physics chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.